Air Dog ll return lines
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Elder User
Joined: May 2007
Posts: 943
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From: North East, MD
Air Dog ll return lines
I just realized that the air dog return line goes back to the fill neck. How do I address this since i have 2 fuel tanks? Has anyone installed one for this as a complete stand alone? No fuel bowl or stock lift pump. Some guys are saying i need to have an electric pump to feed it but pureflows diagram shows the lift pump between the motor and air dog (diagram for a super duty). And since the unit is regulated up to 75psi why won't it work by it's self? What am I missing?
Hotshot
Joined: Jun 2007
Posts: 10,008
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From: Austin, TX
you will have to figure out a way to run that return from the air dog to the factory return line at the tank selector. you can't just run fuel line from the return on the pump to the factory steel return line???
Posting Guru
Joined: Mar 2008
Posts: 1,669
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From: Billerica, MA
Ya it was the general consencus that the easiest way to do it would be to tie the two tanks together so that it's like the SD with "one" tank. As for the still needing an electric pump along with the airdog system I am not sure cuz I don't remember if that was covered in the last thread. I'm pretty sure it was the last thread you started
Freshman User
Joined: Oct 2009
Posts: 48
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From: Boca Raton, Fl
Maybe a dumb question...
I was also considering the AirDog pump system, but was conserned about the return lines from the heads back to the tank. All the other regulated return kits utilize the factory return lines on the heads then through a FPR to the factory tank return line. Now for the question. If the AirDog has a FPR built into it, couldn't we just plug one set of fuel fittings at the heads, running just the supply line into the engine compartment?
Posting Guru
Joined: Nov 2001
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From: Ft Scott
1) Put a sump in the bottom of the rear tank and have it dump into the side of the front tank. If you do it this way you can bypass the stock selector valve. Draw fuel from the front tank and have both returns return fuel to the rear tank.
2) Use a 3 port pollak valve and wire it so that it returns excess fuel from the pump to the filler neck of the same tank that you are drawing fuel from.
3)Return the fuel from the pump to a "t" in the return line from the engine. You'll have to "t" into the return between the engine and the factory selector valve so that the valve can return fuel to the same tank you are using. I've done this before with a 7psi holley red pump to transfer fuel from an auxiliary tank and it worked great but I am not sure how well it will work with an AD pump because of the pressure difference between the return from airdog and the return fuel from the heads.
Does your AD have a separate pressure regulator to mount in the engine compartment or does it use the one built into the pump.. If it uses the internal regulator there will be no return from the heads and you'll basically be downgrading you fuel system to a deadhead setup like the 99-03 SD's had.
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Hotshot
Joined: Oct 2003
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From: Ashland City, TN
I'm so confused with the "air dog" system.
I don't remember Neal having any troubles with the Beans Diesel system..... =\
I don't remember Neal having any troubles with the Beans Diesel system..... =\
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Posting Guru
Joined: Nov 2001
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From: Ft Scott
I've got Beans system with twin pumps on the PSD and an AirDog 150 on the 24V.
Hotshot
Joined: Jun 2007
Posts: 10,008
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From: Austin, TX
i think your confused b/c the SD pumps are just normal pumps. they pull then push fuel and have no returns from the pump. i think he is saying the air dog has a return line on it so you have to find a way to make the return on the air dog work as well as the factory return from the engine.. i'm not too sure on this pump. i know i will not be getting one though. using pumps like the SD pump is just too simple to use and still utilize the factory return lines.
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
Oh, okay that makes more sense I guess with the return line. I think.
I also think, i'd have a hard time buying anything for fuel that has the words "air" and "dog" In them.
Cause, I'd hate my truck to be a dog, and have air in the fuel.
HAHA.
I also think, i'd have a hard time buying anything for fuel that has the words "air" and "dog" In them.
Cause, I'd hate my truck to be a dog, and have air in the fuel.
HAHA.
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Elder User
Joined: May 2007
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From: North East, MD
All figured out
I talked with pureflows tech line last week and had alot of stuff cleared up.
1) the Airdog II is a stand alone unit- you plumb from the take to it and from it to the head. You don't need any of the stock fuel system at all.
2) for the return all you need to do is pick a tank to run the return line to. The amount of return is minimal enough that you do not have to worrry about weather it is going into the tank you are using. It will just throw your fuel milage off a little when calc individual tanks.
1) the Airdog II is a stand alone unit- you plumb from the take to it and from it to the head. You don't need any of the stock fuel system at all.
2) for the return all you need to do is pick a tank to run the return line to. The amount of return is minimal enough that you do not have to worrry about weather it is going into the tank you are using. It will just throw your fuel milage off a little when calc individual tanks.
Hotshot
Joined: Jun 2007
Posts: 10,008
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From: Austin, TX
hmm... the return may be minimal, but i would think its more than they are making it sound like... i could easily be wrong though. i still need clarification though. does the pump have a spot to hook the factory return up to so that you can do this... run the supply from the pump, to the rear driver side head, then from the front of the driver side head straight over to the front of the passenger side head, out the rear of passenger side head. now your returning to the tank from the rear passenger side head so could this run to the pump then to the selector or does the pump not allow this to happen? this is how we regulate the fuel pressure. off the return line so if you can run your return line to the pump so the pump regulates that part then from the pump run the return line to the factory selector so it works like its supposed to.. i didn't know if the pump would allow this to happen.
gues what i'm asking is does it return straight from the pump or do you still run the return from the engine to the pump since the pump has a regulator???
gues what i'm asking is does it return straight from the pump or do you still run the return from the engine to the pump since the pump has a regulator???
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
oh. ok well one thing you DON'T want is a dead head system like the SD's. like Rodney said before, if it is not able to regulate the return line like this it will end up being a dead head setup therefore down grading your fuel system.
your AD pump needs a regulator which you can attach the return line to then the fuel would come out the other end of the regulator out to the factory selector valve. if your pump in internally regulated then i doubt there will be a way to do this unless you try one of the first 2 options Rodney gave you.
your AD pump needs a regulator which you can attach the return line to then the fuel would come out the other end of the regulator out to the factory selector valve. if your pump in internally regulated then i doubt there will be a way to do this unless you try one of the first 2 options Rodney gave you.
